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What does synchronous mean in database mirroring?
This article is about the Synchronous Database Mirroring misconceptions. Synchronous is one of the operating modes of SQL Database Mirroring also known as High Safety mode; High Safety of transactions in case of failover. When the session begins, the principal server begins sending its active log to the mirror server.
How many transactions are sent to a mirror server?
Rate at which transactions are being sent to the mirror server instance, in KB per second. Rate at which incoming transactions are being entered into the principal’s log, in KB per second.
What does synchronous mean in Microsoft SQL Server?
Synchronous is one of the operating modes of SQL Database Mirroring also known as High Safety mode; High Safety of transactions in case of failover. Let’s see what Microsoft TechNet says: When the session begins, the principal server begins sending its active log to the mirror server.
How often does the database mirroring monitor update the table?
Database Mirroring Monitor Job updates the table once a minute by default (a system administrator can specify an update period of 1 to 120 minutes). Database Mirroring Monitor, in contrast, updates the table automatically every 30 seconds. For these updates, Database Mirroring Monitor Job and Database Mirroring Monitor call sp_dbmmonitorupdate.
When to use database mirroring in SQL Server 2016?
For information about editions that fully support database mirroring, see “High Availability (Always On)” in Editions and Supported Features for SQL Server 2016. When transaction safety is set to OFF, the database mirroring session operates asynchronously.
What does it mean to be in synchronous commit Availability mode?
Synchronous-Commit Availability Mode. Under synchronous-commit availability mode (synchronous-commit mode), after being joined to an availability group, a secondary database catches up to the corresponding primary database and enters the SYNCHRONIZED state.